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QTest::CrashHandler: add asyncSafeToHexString()

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Extracted from existing code; I'm going to need it for some GDB/LLDB
commands in an upcoming commit.

Change-Id: I7bdb7ef287ecd924df5cfffdc5aa3617540f7756
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
This commit is contained in:
Thiago Macieira 2025-05-14 18:39:22 -07:00
parent a0c7ca3773
commit ee04a324ce
1 changed files with 17 additions and 6 deletions
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23
src/testlib/qtestcrashhandler_unix.cpp
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@ -184,6 +184,20 @@ std::string_view asyncSafeToString(int n, AsyncSafeIntBuffer &&result = Qt::Unin
#endif #endif
return std::string_view(result.array.data(), ptr - result.array.data()); return std::string_view(result.array.data(), ptr - result.array.data());
}; };
std::string_view asyncSafeToHexString(quintptr u, char *ptr)
{
// We format with leading zeroes so the output is of fixed length.
// Formatting to shorter is more complex and unnecessary here (unlike
// decimals above).
int shift = sizeof(quintptr) * 8 - 4;
ptr[0] = '0';
ptr[1] = 'x';
for (size_t i = 0; i < sizeof(quintptr) * 2; ++i, shift -= 4)
ptr[i + 2] = QtMiscUtils::toHexLower(u >> shift);
return std::string_view(ptr, sizeof(quintptr) * 2 + 2);
}
} // unnamed namespace } // unnamed namespace
namespace QTest { namespace QTest {
@ -422,15 +436,12 @@ printSentSignalInfo(T *info)
template <typename T> static std::enable_if_t<sizeof(std::declval<T>().si_addr) >= 1> template <typename T> static std::enable_if_t<sizeof(std::declval<T>().si_addr) >= 1>
printCrashingSignalInfo(T *info) printCrashingSignalInfo(T *info)
{ {
using HexString = std::array<char, sizeof(quintptr) * 2>; using HexString = std::array<char, sizeof(quintptr) * 2 + 2>;
auto toHexString = [](quintptr u, HexString &&r = {}) { auto toHexString = [](quintptr u, HexString &&r = {}) {
int shift = sizeof(quintptr) * 8 - 4; return asyncSafeToHexString(u, r.data());
for (size_t i = 0; i < sizeof(quintptr) * 2; ++i, shift -= 4)
r[i] = QtMiscUtils::toHexLower(u >> shift);
return std::string_view(r.data(), r.size());
}; };
writeToStderr(", code ", asyncSafeToString(info->si_code), writeToStderr(", code ", asyncSafeToString(info->si_code),
", for address 0x", toHexString(quintptr(info->si_addr))); ", for address ", toHexString(quintptr(info->si_addr)));
} }
[[maybe_unused]] static void printCrashingSignalInfo(...) {} [[maybe_unused]] static void printCrashingSignalInfo(...) {}